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5.2 TCP/IP Sample Programs
We have provided a number of sample programs demonstrating various uses of TCP/IP for
networking embedded systems. These programs require that you connect your PC and the
BL2000 together on the same network. This network can be a local private network (pre-
ferred for initial experimentation and debugging), or a connection via the Internet.
5.2.1 How to Set IP Addresses in the Sample Programs
With the introduction of Dynamic C 7.30 we have taken steps to make it easier to run
many of our sample programs. Instead of the
see a
macro. This macro tells Dynamic C to select your configuration from a
TCPCONFIG
list of default configurations. You will have three choices when you encounter a sample
program with the
TCPCONFIG
1. You can replace the
MY_NETMASK, MY_GATEWAY
2. You can leave
TCPCONFIG
to
, the netmask to
10.10.6.100
to
. If you would like to change the default values, for example, to use an IP
10.10.6.1
address of
10.1.1.2
the values in the section that directly follows the "General Configuration" comment in
the
TCP_CONFIG.LIB
3. You can create a
CUSTOM_CONFIG.LIB
than 100. Instructions for doing this are at the beginning of the
There are some other "standard" configurations for
ent features such as DHCP. Their values are documented at the top of the
library. More information is available in the Dynamic C TCP/IP
TCP_CONFIG.LIB
User's Manual.
IP Addresses Before Dynamic C 7.30
Most of the sample programs such as shown in the example below use macros to define the
IP address assigned to the board and the IP address of the gateway, if there is a gateway.
#define MY_IP_ADDRESS "10.10.6.170"
#define MY_NETMASK "255.255.255.0"
#define MY_GATEWAY "10.10.6.1"
#define MY_NAMESERVER "10.10.6.1"
In order to do a direct connection, the following IP addresses can be used for the BL2000:
#define MY_IP_ADDRESS "10.1.1.2"
#define MY_NETMASK "255.255.255.0"
// #define MY_GATEWAY "10.10.6.1"
// #define MY_NAMESERVER "10.10.6.1"
In this case, the gateway and nameserver are not used, and are commented out. The IP
address of the board is defined to be
as
.
10.1.1.1
User's Manual
macro.
macro with individual
TCPCONFIG
, and
MY_NAMESERVER
at the usual default of 1, which will set the IP configurations
255.255.255.0
for the BL2000 board, and
library. You will find this library in the
10.1.1.2
and other macros, you will
MY_IP_ADDRESS
MY_IP_ADDRESS
macros in each program.
, and the nameserver and gateway
for your PC, you can edit
10.1.1.1
library and use a
TCPCONFIG
TCPCONFIG
. The IP address of you PC can be defined
,
directory.
LIB\TCPIP
value greater
TCP_CONFIG.LIB
that let you select differ-
file.
53
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